CORRESPONDENCE_1992-1999 - Laserfiche WebLink

Home Browse Search

WASTE DISCHARGE REQUIREMENTS -8- COUNTY OF SAN JOAQUIN NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY Landfill Specifications 10. Municipal solid waste shall be discharged to either (a) that portion of a waste management unit which received wastes (i.e. that active portion of the waste management unit which is within the boundaries of the Existing Footprint), or (b) to an area equipped with a containment system which meets the additional requirements for both liners and leachate collection systems specified below. 11. All containment systems installed after 9 October 1993 shall either: �a) include a composite liner which consists of an upper synthetic flexible membrane component (synthetic liner or SL) and a lower component of soil. The SL shall be at least 40-mils thick (or at least 60-mils thick if high density polyethylene) and shall be installed in direct and uniform contact with the underlying compacted soil component. The lower component shall be compacted soil that is at least two feet thick and that has an hydraulic conductivity of no more than 1 x 10-' cm/sec (this specification is referred to as the Prescriptive Design); or (b) a GCL with a hydraulic conductivity no more than 1 x 10-' cm/sec, may be substituted for the soil component in the bottom liner and an 80 mil HDPE liner may be substituted for the composite liner in the sidewalls. 12. All containment systems installed prior to 9 October 1993 where wastes have not been discharged and which will accept wastes after 9 October 1993 shall include a composite liner which features as its uppermost component a synthetic liner (SL). The SL shall be at least 40-mils thick (or at least 60-mils thick if high density polyethylene) and shall be installed in direct and uniform contact with the underlying materials. The composite liner shall meet the performance criteria contained in 40 CFR Z58.40(a)(1) and (c). 13. New landfill units and lateral expansions shall not be located in wetlands unless the Discharger has successfully completed, and the Board has approved. all demonstrations required for such discharge under 40 CFR 258.12(a). 14. Landfill leachate shall be discharged by a method approved by the Board. WNW Closure Specifications 15. At closure. WMUs shall receive a final cover consisting, at a minimum. of a two-foot thick foundation layer which may contain waste materials, overlain by a one-foot thick clay liner, and finally by a one-foot thick vegetative soil layer, or an engineered